Headphone charging case



FIG. 1 is a bottom, rear, left side perspective view of a headphone charging case, shown closed, in a first configuration;

FIG. 2 is a top, rear perspective view of the headphone charging case of FIG. 1, shown open, in a second configuration;

FIG. 3 is a left side elevation view of the headphone charging case of FIG. 1, shown in the first configuration;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a right side elevation view thereof; and,

FIG. 8 is a front elevation view thereof.

The equal-length broken lines in the drawings depict portions of the headphone charging case that form no part of the claimed design. 

CLAIM The ornamental design for a headphone charging case, as shown and described. 